Title :

In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope

Author(s) :

Idrissi, Hosni [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Samaee, Vahid [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Lumbeeck, Gunnar [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Werf, Thomas [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Pardoen, Thomas [Auteur]
Institute of Mechanics, Materials and Civil Engineering [Louvain] [IMMC]
Schryvers, Dominique [Auteur]
Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Journal title :

Journal of Geophysical Research: Solid Earth

Abbreviated title :

J. Geophys. Res. Solid Earth

Volume number :

125

Pages :

e2019JB018383

Publisher :

American Geophysical Union (AGU)

Publication date :

2020-03

English keyword(s) :

antigorite
transmission electron microscopy
Plastic deformation
In situ
Tensile test
grain boundary sliding

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre/Minéralogie

English abstract : [en]

The determination of the mechanical properties of serpentinites is essential towards the understanding of the mechanics of faulting and subduction. Here, we present the first in situ tensile tests on antigorite in a ...
Show more >The determination of the mechanical properties of serpentinites is essential towards the understanding of the mechanics of faulting and subduction. Here, we present the first in situ tensile tests on antigorite in a transmission electron microscope. A push-to-pull deformation device is used to perform quantitative tensile tests, during which force and displacement are measured, while the evolving microstructure is imaged with the microscope. The experiments have been performed at room temperature on 2×1×0.2 〖"µm" 〗^3 beams prepared by focused ion beam. The specimens are not single crystals despite their small sizes. Orientation mapping indicated that several grains were well-oriented for plastic slip. However, no dislocation activity has been observed even though the engineering tensile stress went up to 700 MPa. We show also that antigorite does not exhibit a purely elastic-brittle behavior since, despite the presence of defects, the specimens accumulate permanent deformation and did not fail within the elastic regime. Instead, we observe that strain localizes at grain boundaries. All observations concur to show that under these experimental conditions, grain boundary sliding is the dominant deformation mechanism. This study sheds a new light on the mechanical properties of antigorite and calls for further studies on the structure and properties of grain boundaries in antigorite and more generally in phyllosilicates.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

Rheology of Earth materials: closing the gap between TIMEscales in the laboratory and in the MANtle

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Plasticité

Submission date :

2020-03-09T10:38:24Z
2020-03-16T09:05:40Z
2020-03-26T10:57:55Z